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The reaction to the shooting has largely been focused on witness cellphone video of the encounter

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Negative moderators, present at high or intense levels, may impinge on the interventions effectiveness, thus necessitating change to the proposed intervention or an adjunct effort 17

In a randomised controlled trial, where the particular new drug being investigated is clearly working and alleviating harm for the intervention group receiving it, a point is reached where it becomes unethical to continue withholding that drug from the control group